I am thankful for this site and for the many links provided. I have been going through one of the tutorials, but as I try some things, they don't seem to work.
I am wondering if there is something I need first before being able to use a tutorial (like version number (HP-UX) or how I am getting... (1 Reply)
I use FreeBSD,and use signal,like follows:
signal(SIGHUP,sig_hup);
signal(SIGIO,sig_io);
when I run call following code,it can run,but I find a puzzled question,it should print some information,such as printf("execute main()") will print execute main(),but in fact,printf fuction print... (2 Replies)
Hi all.
I have a script as below:
cutmth=`TZ=CST+2160 date +%b`
export cutmth
echo $cutmth >> date.log
sed -n "/$cutmth/$p" alert_sbdev1.log > alert_summ.log
My purpose is to run through the alert_sbdev1.log and find the 1st occurence of 'Jan' and send everything after that line to... (4 Replies)
Following code is detecting solaris daytime,when I run it,I can't get any result,code is follows:
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BUFFSIZE 150
int main(){
... (2 Replies)
Hello all!
I have problem in hp-ux 11.11 in awk
I want to grep sar -d 2 1 only 3 column, but have error in awk in hp-ux 11.11
Example:
#echo 123 234 | awk '{print $2}'
123 234
The situattions in commands bdf | awk {print $5}' some...
In hp-ux 11.31 - OK!
How resolve problem (15 Replies)
Hi all.
The startup script in /usr/local/bin.
After user login the script run an application.
Iwould in the same way run the another application.
How to make It similar?
Where I must to look?
Regards. (3 Replies)
Hi,
I installed solaris 10 x86 on my local system. it was working fine. today when i started the system, it started up without any problem. when i tried to open the terminal it didn't open any terminal.
Plz help me (0 Replies)
Hello:
I can't get equivalence classes to work in globs or when passing them to tr. If I understood correctly, matches e, é, è, ê, etc. But when using them with utilities like tr they don't work. Here's an example found in the POSIX standard:
I decided to create the aforementioned files in... (9 Replies)
Discussion started by: Cacializ
9 Replies
LEARN ABOUT DEBIAN
bup-margin
bup-margin(1) General Commands Manual bup-margin(1)NAME
bup-margin - figure out your deduplication safety margin
SYNOPSIS
bup margin [options...]
DESCRIPTION
bup margin iterates through all objects in your bup repository, calculating the largest number of prefix bits shared between any two
entries. This number, n, identifies the longest subset of SHA-1 you could use and still encounter a collision between your object ids.
For example, one system that was tested had a collection of 11 million objects (70 GB), and bup margin returned 45. That means a 46-bit
hash would be sufficient to avoid all collisions among that set of objects; each object in that repository could be uniquely identified by
its first 46 bits.
The number of bits needed seems to increase by about 1 or 2 for every doubling of the number of objects. Since SHA-1 hashes have 160 bits,
that leaves 115 bits of margin. Of course, because SHA-1 hashes are essentially random, it's theoretically possible to use many more bits
with far fewer objects.
If you're paranoid about the possibility of SHA-1 collisions, you can monitor your repository by running bup margin occasionally to see if
you're getting dangerously close to 160 bits.
OPTIONS --predict
Guess the offset into each index file where a particular object will appear, and report the maximum deviation of the correct answer
from the guess. This is potentially useful for tuning an interpolation search algorithm.
--ignore-midx
don't use .midx files, use only .idx files. This is only really useful when used with --predict.
EXAMPLE
$ bup margin
Reading indexes: 100.00% (1612581/1612581), done.
40
40 matching prefix bits
1.94 bits per doubling
120 bits (61.86 doublings) remaining
4.19338e+18 times larger is possible
Everyone on earth could have 625878182 data sets
like yours, all in one repository, and we would
expect 1 object collision.
$ bup margin --predict
PackIdxList: using 1 index.
Reading indexes: 100.00% (1612581/1612581), done.
915 of 1612581 (0.057%)
SEE ALSO bup-midx(1), bup-save(1)BUP
Part of the bup(1) suite.
AUTHORS
Avery Pennarun <apenwarr@gmail.com>.
Bup unknown-bup-margin(1)